Interesting link, Cheryl.
None of the maps seem to be the same. The one I've always referred to is below, because it is a good north/south gradient visual:
(I don't happen to believe the north/south gradient theory anyway, but it's a cool pic of it.
)
Cherie
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I am not a Neurologist, Physician, Nurse, or Hairdresser ... but I have learned that it is not such a great idea to give oneself a haircut after three margaritas
.